Frame for a bicycle



FIG. 1 is a right side perspective view of a frame for a bicycle embodying my new design; and,

FIG. 2 is a right side perspective view thereof in which the seat post is extended and attached front seat is raised.

The broken line showing of bicycle elements beyond the bicycle frame are provided for the purpose of illustrating environmental structure and form no part of the claimed design. 

CLAIM The ornamental design for a frame for a bicycle, as shown and described. 